/// <summary>
/// Create an appropriate sync state for an appointment item.
/// </summary>
/// <remarks>Outlook items are not true objects and don't have a common superclass,
/// so we have to use this rather clumsy overloading.</remarks>
/// <param name="appointment">The item.</param>
/// <returns>An appropriate sync state, or null if the appointment was invalid.</returns>
private AppointmentSyncState CreateSyncState(Outlook.AppointmentItem appointment)
{
AppointmentSyncState result;
CrmId crmId = appointment.GetCrmId();
if (CrmId.IsValid(crmId) && this.byCrmId.ContainsKey(crmId) && this.byCrmId[crmId] != null)
{
result = CheckUnexpectedFoundState <Outlook.AppointmentItem, AppointmentSyncState>(appointment, crmId);
}
else
{
var modifiedDate = ParseDateTimeFromUserProperty(appointment.UserProperties[ModifiedDatePropertyName]);
if (appointment.IsCall())
{
result = this.SetByOutlookId <AppointmentSyncState>(appointment.EntryID,
new CallSyncState(appointment, crmId, modifiedDate));
}
else
{
result = this.SetByOutlookId <AppointmentSyncState>(appointment.EntryID,
new MeetingSyncState(appointment, crmId, modifiedDate));
}
this.byGlobalId[appointment.GlobalAppointmentID] = result;
}
if (result != null && CrmId.IsValid(crmId))
{
this.byCrmId[crmId] = result;
}
return(result);
}